<template>
	<view class="u-wrap">
		<view class="u-search-box">
			<u-search placeholder="输入商品名称" v-model="keyword" @custom="searchGoods" @clear="clearSearch"></u-search>
		</view>
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
				<!--  :key="item.id"   index + '-' + index1  -->
				<block v-for="(item,index) in categories">
					<view v-for="(item1,index1) in item.children"
					 :key="item1.id"
						class="u-tab-item"
					 :class="[current == item1.id ? 'u-tab-item-active' : '']"
					 :data-current="item1.id"
					 @tap.stop="swichMenu(item1.id)">
						<text class="u-line-1">{{item1.name}}</text>
					</view>
				</block>
			</scroll-view>
			<block>
				<scroll-view scroll-y class="right-box" @scrolltolower="getGoods">
					<view class="page-view">
						<view class="class-item">
							<view class="item-container">
								<navigator class="thumb-box u-p-b-40 u-p-t-40"
								 v-for="goods in goodsList"
								 :key="goods.id"
								 :url="'/pages/goods/show?id=' + goods.id"
								 >
									<image class="item-menu-image" :src="goods.cover_url" mode=""></image>
									<view class="item-menu-name ">{{goods.title}}</view>
								</navigator>
								<view v-if="goodsList.length == 0" class="u-flex-1 u-p-t-80 u-p-b-80">
									<u-empty  text="该分类暂无书籍" mode="list"></u-empty>
								</view>
								
							</view>
						</view>
					</view>
				</scroll-view>
			</block>
		</view>
	</view>
</template>
<script>
export default {
	data() {
		return {
			categories: {},//分类数据
			goodsList: [],//商品数据
			scrollTop: 0, //tab标题的滚动条位置
			current: null, // 预设当前项的值  '0-0'
			menuHeight: 0, // 左边菜单的高度
			menuItemHeight: 0, // 左边菜单item的高度
			keyword: '',	//搜索关键字
			page: 1,	//分页
			isLastPage: false //是否最后一页
		}
	},
	onLoad(){
		this.getData()
	},
	methods: {
		// 请求商品数据
		async getData(){
			const params = {
				page: this.page,
				title: this.keyword
			}
			// 判断是否有分类id
			if(this.current) params.category_id = this.current
			const res = await this.$u.api.goodsList(params)
			console.log(res)
			this.categories = res.categories
			this.goodsList = [...this.goodsList,...res.goods.data]
			this.isLastPage = res.goods.next_page_url ? false : true
		},
		// 搜索商品
		searchGoods(){
			this.page = 1
			this.goodsList = []
			this.getData()
		},
		// 清除商品
		clearSearch(){
			this.page = 1
			this.goodsList = []
			this.keyword = ''
			this.getData()
		},
		// 滑动到底部刷新
		getGoods(e){
			if(this.isLastPage) return
			this.page = this.page + 1
			this.getData()
			console.log(e)
			
		},
		getImg() {
			return Math.floor(Math.random() * 35);
		},
		// 点击左边的栏目切换
		async swichMenu(cid) {
			if(cid == this.current) return ;
			this.current = cid;
			this.goodsList = []
			this.page = 1
			
			this.getData()
		},
	
	}
}
</script>

<style lang="scss" scoped>
	.u-wrap {
		height: calc(100vh);
		/* #ifdef H5 */
		height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}

	.u-search-box {
		padding: 18rpx 30rpx;
	}

	.u-menu-wrap {
		flex: 1;
		display: flex;
		overflow: hidden;
	}

	.u-search-inner {
		background-color: rgb(234, 234, 234);
		border-radius: 100rpx;
		display: flex;
		align-items: center;
		padding: 10rpx 16rpx;
	}

	.u-search-text {
		font-size: 26rpx;
		color: $u-tips-color;
		margin-left: 10rpx;
	}

	.u-tab-view {
		width: 200rpx;
		height: 100%;
	}

	.u-tab-item {
		height: 110rpx;
		background: #f6f6f6;
		box-sizing: border-box;
		display: flex;
		align-items: center;
		justify-content: center;
		font-size: 26rpx;
		color: #444;
		font-weight: 400;
		line-height: 1;
	}
	
	.u-tab-item-active {
		position: relative;
		color: #000;
		font-size: 30rpx;
		font-weight: 600;
		background: #fff;
	}
	
	.u-tab-item-active::before {
		content: "";
		position: absolute;
		border-left: 4px solid $u-type-primary;
		height: 32rpx;
		left: 0;
		top: 39rpx;
	}

	.u-tab-view {
		height: 100%;
	}
	
	.right-box {
		background-color: rgb(250, 250, 250);
	}
	
	.page-view {
		padding: 16rpx;
	}
	
	.class-item {
		margin-bottom: 30rpx;
		background-color: #fff;
		padding: 16rpx;
		border-radius: 8rpx;
	}
	
	.item-title {
		font-size: 26rpx;
		color: $u-main-color;
		font-weight: bold;
	}
	
	.item-menu-name {
		font-weight: normal;
		font-size: 24rpx;
		text-align: center;
		color: $u-main-color;
	}
	
	.item-container {
		display: flex;
		flex-wrap: wrap;
	}
	
	.thumb-box {
		width: 50%;
		display: flex;
		align-items: center;
		justify-content: center;
		flex-direction: column;
		margin-top: 20rpx;
	}
	
	.item-menu-image {
		width: 120rpx;
		height: 120rpx;
	}
</style>
